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Ruger Mark III/IV 509T mount — image 1

Ruger Mark III/IV 509T mount

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Two-screw mount for a Holosun 509T to fit on Ruger Mk III and IV target pistols

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Quick and dirty 509T mount, because optics should cost more than the gun, right? /s

This is designed around the default rail screws, or replacements like the set of 4 Torx screws on Tandemkross.

Tested with nozzle sizes from 0.25 to 0.6, all work perfectly. Max recommended Z height is 0.15/0.16mm, larger than that and you risk needing to do some fitting for the 509's recoil lug channel.